The Dragan effect is an effect to get pictures with higher contrast. The main element is overexposed compared to others items. With this effect we attach importance to details, for instance, facial wrinkles and therefore it's pretty useful to show the passage of time.

There are many tutorials on Internet that explain the steps to follow in photoshop to get it. Personally, I advise to be clear about the direction of the light and which parts of the image we are going to overexposure.